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Subtractors
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bullet Interactive demo of Adder/Subtractors:  http://users-tima.imag.fr/cis/guyot/Cours/Oparithm/english/Adspec.htm

 
   One way to make a Subtractor could be a redefinition of the Half Adder / Full Adder to Half Subtractor / Full Subtractor

 (Can be found in textbooks etc.)